firmament
/ˈfɜːməm(ə)nt/noun
High School
1
The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
2
The field or sphere of an activity or interest.
3
In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; (countable, by extension) any celestial sphere.
4
The abode of God and the angels; heaven.
5
A piece of jewellery worn in a headdress with numerous gems resembling stars in the sky.
6
A basis or foundation; a support.
7
The act or process of making firm or strengthening.
#obsolete